Vehicle seat having a suspension unit for cushioning rolling and vertical suspension movements

ABSTRACT

The invention relates to a vehicle seat having a suspension unit for cushioning the rolling and vertical suspension movements of the vehicle seat, wherein the vehicle seat has a vehicle seat upper part and a vehicle seat lower part, wherein the vehicle seat upper part and the vehicle seat upper part are connected by means of the suspension unit so that the vehicle seat upper part and the vehicle seat lower part are movable relative to one another, wherein the suspension unit comprises a scissor arrangement having a first scissor arm and a second scissor arm, characterised in that the suspension unit is rotatably connected about a first axis of rotation to the vehicle seat lower part and comprises a spring element support and a first spring element, the first spring element being connected on the one hand to the vehicle seat lower part and on the other hand to the spring element support which is rotatably connected about a second axis of rotation to the first scissor arm and rotatably connected about a third axis of rotation to the second scissor arm, and the first spring element being preferably arranged at a first angle to a vehicle seat width direction and at a second angle to a vehicle seat height direction.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of German Patent Application No.102019134233.3 filed Dec. 13, 2019, the entire contents of which areincorporated herein by reference.

FIELD

The invention relates to a vehicle seat having a suspension unit forcushioning the rolling and vertical suspension movements of the vehicle,wherein the vehicle seat has a vehicle seat upper part and a vehicleseat lower part, wherein the vehicle seat upper part and the vehicleseat lower part are connected by means of the suspension unit so thatthe vehicle seat upper part and the vehicle seat lower part are movablerelative to one another, wherein the suspension unit comprises a scissorarrangement having a first scissor arm and a second scissor arm.

BACKGROUND

Vehicle seats having roll and vertical suspensions are known from theprior art; for example, WO 2014/176130 A discloses a roll suspensionwhich can cushion rolling movements of the vehicle or the vehicle seat.However, such a rolling movement, as shown in the prior art, is verycomplex to implement in terms of design, requires many activelycontrolled components, and takes up a large amount of space.

SUMMARY

The object of the present invention is therefore to provide a vehicleseat having a suspension unit for cushioning rolling and verticalsuspension movements, which is constructed in a simpler manner than thatshown in the prior art.

The core idea of the present invention is to provide a vehicle seathaving a suspension unit for cushioning rolling and vertical suspensionmovements of the vehicle, wherein the vehicle seat has a vehicle seatupper part and a vehicle seat lower part, wherein the vehicle seat upperpart and the vehicle seat lower part are connected by means of thesuspension unit so that the vehicle seat upper part and the vehicle seatlower part are movable relative to one another, wherein the suspensionunit comprises a scissor arrangement having a first scissor arm and asecond scissor arm, the suspension unit being connected rotatably abouta first axis of rotation to the vehicle seat lower part and comprising aspring element support and a first spring element, the first springelement being connected on the one hand to the vehicle seat lower partand on the other hand to the spring element support which preferably isrotatably connected about a second axis of rotation to the first scissorarm and rotatably connected about a third axis of rotation to the secondscissor arm, and the first spring element being preferably arranged at afirst angle to a vehicle seat width direction and at a second angle to avehicle seat height direction.

Alternatively, the underlying object is achieved by a vehicle seathaving a suspension unit for cushioning rolling and vertical suspensionmovements of the vehicle, wherein the vehicle seat has a vehicle seatupper part and a vehicle seat lower part, wherein the vehicle seat upperpart and the vehicle seat lower part are connected by means of thesuspension unit so that the vehicle seat upper part and the vehicle seatlower part are movable relative to one another, wherein the suspensionunit comprises a scissor arrangement having a first scissor arm and asecond scissor arm, the suspension unit being connected rotatably abouta first axis of rotation to the vehicle seat lower part and comprising afirst spring element, the first spring element being connected on theone hand to the vehicle seat lower part and on the other hand to thevehicle seat upper part, and the first spring element being preferablyarranged at a first angle to a vehicle seat width direction and at asecond angle to a vehicle seat height direction.

A “rolling movement” is understood in this case to mean a rotationalmovement of the vehicle seat about an axis of rotation which is arrangedto run in the longitudinal direction of the vehicle seat.

The first axis of rotation is therefore particularly preferably arrangedparallel to the vehicle seat longitudinal direction.

According to a preferred embodiment, it is also provided that thevehicle seat upper part and the vehicle seat lower part can be cushionedor moved or displaced relative to one another by means of the suspensionunit.

According to a particularly preferred embodiment, the first springelement is preferably one selected from an air spring and a mechanicalspring.

In particular, the first spring element is arranged to run in thedirection of the first angle and of the second angle, i.e. the firstspring element is arranged to run obliquely as seen in a standardcoordinate system.

The standard coordinate system is formed from the vehicle seatlongitudinal direction, the vehicle seat width direction and the vehicleseat height direction, which are each arranged at a right angle to oneanother.

Because, according to the invention, the first spring element isconnected to the spring element support and the vehicle seat lower part,it can be concluded that the first angle and the second angle are afunction of the spring position of the vehicle seat. By a suspensionmovement, which can be a rolling and/or vertical suspension movement,the position of the spring element support changes in space, so that afirst end of the first spring element also changes its position inspace, wherein a second end of the first spring element, which isconnected to the vehicle seat lower part, is not changed in itsposition. This means in particular that the first angle and the secondangle are not constant during a suspension movement of the vehicle seat.In a neutral position, which means that the vehicle seat is not subjectto any suspension movement, i.e. there is no relative movement of thevehicle seat upper part with respect to the vehicle seat lower part, thefirst angle and the second angle are constant.

Depending on the size of the first angle and the second angle, it ispossible to adjust the spring stiffness of the first spring element. Thespring stiffness is in particular an adjustment option for the verticaldirection and for the rolling direction for the suspension movement. Byadjusting the first angle and the second angle, it is possible to adjustthe spring stiffness with regard to the vertical direction and therolling direction or the rolling spring direction and vertical springdirection.

It is particularly preferred that the first scissor arm and the secondscissor arm intersect in a first region, viewed in the vehicle seatlongitudinal direction, wherein provision is made that no structuralconnection is provided between the first scissor arm and the secondscissor arm, with the exception of the spring element support. Thismeans in particular that when the vehicle seat upper part moves withrespect to the vehicle seat lower part, the first region, whichrepresents the intersection region of the first scissor arm with thesecond scissor arm, must follow the movement of the vehicle seat. Inparticular, this means that there is no common axis of rotation betweenthe first scissor arm and the second scissor arm.

According to an alternative configuration, a structural connection isprovided between the first scissor arm and the second scissor arm, sothat the scissor arrangement is a scissor frame in the conventionalsense, i.e. the scissor arms are rotatably connected to one anotherabout a common axis of rotation. In this case, the spring elementsupport is preferably fastened directly to the common axis of rotation.

It can be provided that the first scissor arm and the second scissor armare force-connected, for example by a frictional force, if the scissorarms are in contact with one another.

The above-described forced guidance or forced movement of the springelement support due to the movement of the vehicle seat upper partrelative to the vehicle seat lower part produces a spring force of thefirst spring element, so that cushioning of the vehicle seat is causedby the suspension unit.

Generally speaking, when the vehicle seat upper part moves relative tothe vehicle seat lower part in a vertical direction, i.e. in the vehicleseat height direction, due to an external force acting on the vehicleseat, the rotatable arrangement of the spring element support on thefirst scissor arm or the second scissor arm causes a correspondingmovement of the spring element support. This means that in the event ofa vertical deflection, i.e. a deflection in the vehicle seat heightdirection, the spring element support experiences a linear displacementcorresponding to the vehicle seat upper part in the vehicle seat heightdirection. In the event of a rolling movement of the vehicle seat, i.e.in the event of a rotation of the vehicle seat upper part relative tothe vehicle seat lower part about the first axis of rotation, the springelement support is also subjected to such a rolling movement. The firstspring element is deformed by the rolling movement of the spring elementsupport, so that a spring force is produced which counteracts therolling movement.

According to a particularly preferred embodiment, it is provided thatthe suspension unit comprises a second spring element, wherein thesecond spring element is connected on the one hand to the displacementelement and on the other hand to the spring element support, and whereinthe second spring element is arranged at a third angle to the vehicleseat width direction and arranged at a fourth angle to the vehicle seatheight direction.

As an alternative, the second spring element can particularly preferablybe connected to a further displacement element which is independent ofthe displacement element. This means that the displacement element andthe further displacement element are independent of one another.

The second spring element is particularly preferably arranged in such away that, with respect to a plane formed from the vehicle seatlongitudinal direction and the vehicle seat height direction, the firstspring element is arranged on a first side of the plane and the secondspring element on the second side of the plane.

It is also possible that the first angle corresponds to the third angleand the second angle corresponds to the fourth angle, so that the firstspring element and the second spring element are arranged symmetricallyto one another with respect to the plane formed from the vehicle seatlongitudinal direction and the vehicle seat height direction.

However, it is also possible that the first angle has a different valuefrom the third angle and that the second angle has a different valuefrom the fourth angle.

It is pointed out that “symmetrical” is to be understood to mean in theneutral state, i.e. no external force is acting on the vehicle seat.With a suspension movement of the vehicle seat, the arrangement of thespring elements in relation to one another changes since, in particularduring a rolling movement, one spring element is compressed and theother spring element is correspondingly decompressed, i.e. one springelement is compressed and the other spring element is stretch in itslength.

According to a particularly preferred embodiment, it is provided thatthe first angle and the second angle can each assume a value from arange of 0 to 90°].

According to a further preferred embodiment, it is provided that thethird angle and the fourth angle can each assume a value from a range of0 to 90°].

It is particularly preferably provided that the first angle, the secondangle, the third angle and the fourth angle cannot assume the anglevalue 90°, i.e. the angles can each assume a value in the range of 0 to90°. This means that, when seen in particular in the vehicle seat heightdirection, the spring elements do not correspond to a vertical spring.

According to a further preferred embodiment, it is provided that thefirst axis of rotation is arranged parallel to the vehicle seatlongitudinal direction, and preferably the second axis of rotation andthe third axis of rotation are arranged running in the vehicle seatwidth direction and the second and the third axis of rotation arearranged parallel to one another.

In particular, the arrangement of the second axis of rotation and thethird axis of rotation can prevent the scissor arrangement with thespring element support from tilting, in particular when the vehicle seatupper part moves relative to the vehicle seat lower part.

According to a particularly preferred embodiment, it is provided thatthe first axis of rotation is defined by a shaft which is rotatablyconnected to the vehicle seat lower part. The shaft preferably has afirst end and a second end, wherein the first end and the second endeach are rigidly connected to the vehicle seat lower part. Instead of ashaft, a rod element is also conceivable, wherein it is possible for theshaft or the rod element to be cylindrical or angular. If the rodelement is angular, it is rotatably connected to the vehicle seat lowerpart.

According to a further preferred embodiment, it is provided that thefirst scissor arm is connected to the vehicle seat upper part by meansof a first floating bearing and to the shaft by means of a secondfloating bearing, and the second scissor arm is connected to the vehicleseat upper part by means of a third floating bearing and to the shaft bymeans of a fourth floating bearing. Such a configuration also allows apitching suspension movement of the vehicle seat by means of thesuspension unit.

According to the design of the first scissor arm and the second scissorarm by means of four floating bearings for connection to the vehicleseat upper part and the vehicle seat lower part, it is achieved that thepitching movement of the vehicle seat can be easily followed when thevehicle seat is pitched and when the vehicle seat upper part follows thevehicle seat lower part accordingly. Because four floating bearings areprovided, the suspension unit is mechanically indeterminate, i.e.degrees of freedom still exist which cannot be adequately determined. Inorder to further minimise these degrees of freedom, a first connectingelement and a second connecting element are provided, which minimise thedegrees of freedom of the four floating bearings through thecorresponding arrangement with the first scissor arm and the secondscissor arm and the vehicle seat upper part and the vehicle seat lowerpart. Particularly preferably, a first connecting element is providedwhich connects the first scissor arm to a fixed bearing which isarranged on the first axis of rotation and preferably on the shaft, andwherein a second connecting element is provided which has a firstconnecting element part and a second connecting element part, whereinthe first connecting element part is rotatably connected to the secondscissor arm and the second connecting element part, and wherein thesecond connecting element part is rotatably connected to the firstconnecting element part, the first scissor arm and the vehicle seatupper part.

Alternatively, the scissor arrangement can be such that the firstscissor arm is connected to the vehicle seat lower part by means of afixed bearing and to the vehicle seat upper part by means of a firstfloating bearing and the second scissor arm is connected to the vehicleseat upper part by means of a further fixed bearing and to the vehicleseat lower part by means of a fourth floating bearing.

According to a further preferred embodiment, it is provided that thesecond floating bearing and the fourth floating bearing are eachdesigned as a displacement element so that the first scissor arm and thesecond scissor arm are in each case displaceable relative to the shaft.A displacement with respect to the shaft means that a displacement ofthe first scissor arm and of the second scissor arm is provided in thevehicle seat longitudinal direction. The displacement element can bedesigned as a sliding element or as a rolling element, so that a smoothdisplacement of the first scissor arm and the second scissor armrelative to the shaft can be ensured.

According to a further preferred embodiment, it is provided that, whenviewed in the longitudinal direction of the vehicle seat, the secondfloating bearing is arranged in front of the third floating bearing andthe first floating bearing is arranged in front of the fourth floatingbearing.

By a rolling movement of the vehicle seat and a corresponding trackingof the spring support element, which is in connection with the first orthe second spring element, which can in particular be designed to beresiliently deformable, the spring support element causes deformation ofthe spring elements, whereby a spring force or a restoring force of thespring elements is generated.

According to a further preferred embodiment, a locking unit is providedso that a movement of the suspension unit can be locked about the firstaxis of rotation, so that a rotational movement about the first axis ofrotation can preferably be blocked. This is advantageous if the vehicleis moving on a level surface, such as a street, where usually little orno rolling movements occur.

Alternatively, the object is achieved by a vehicle seat having asuspension unit for cushioning the rolling and vertical movements of thevehicle seat, wherein the vehicle seat has a vehicle seat upper part anda vehicle seat lower part, wherein the vehicle seat upper part and thevehicle seat lower part are connected by means of the suspension unit sothat the vehicle seat upper part and the vehicle seat lower part aremovable relative to one another, wherein the suspension unit comprises ascissor arrangement having a first scissor arm and a second scissor arm,the suspension unit being connected rotatably about a first axis ofrotation to the vehicle seat lower part and comprising a spring elementsupport and a first spring element, a displacement element beingprovided which is mounted displaceably with respect to the vehicle seatlower part, and the first spring element being connected on the one handto the displacement element and on the other hand to the vehicle seatupper part.

The further configurations of the preceding embodiments apply in acorrespondingly analogous manner to this alternative embodiment.

Further advantageous embodiments result from the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Additional aims, advantages and expedient uses of the present inventioncan be found in the following description in conjunction with thedrawings, in which:

FIG. 1A is a perspective view of a vehicle seat according to a preferredembodiment;

FIG. 1B shows the vehicle seat according to FIG. 1A in a furtherembodiment;

FIG. 2A is a front view of the vehicle seat according to FIG. 1A in aneutral position;

FIG. 2B shows the vehicle seat according to FIG. 2A in a downwardlydeflected position;

FIG. 2C shows the vehicle seat according to FIG. 2A in a upwardlydeflected position;

FIG. 3A is a front view of the vehicle seat according to FIG. 1A in theneutral position;

FIG. 3B shows the vehicle seat according to FIG. 3A in a rollingposition;

FIG. 4A shows a comparison between FIGS. 2B and 2C;

FIG. 4B shows a comparison between FIGS. 3A and 3B;

FIG. 5 shows a vehicle seat according to one embodiment with differentangles of attack of the spring elements;

FIG. 6A shows a scissor arrangement according to a first embodiment;

FIG. 6B shows a scissor arrangement according to a second embodiment;

FIG. 7A is a schematic representation of the vehicle seat according toFIG. 1A in the neutral position;

FIG. 7B is a schematic representation of the vehicle seat according toFIG. 1A in the downwardly displaced position;

FIG. 8A is a first perspective view of a spring support element;

FIG. 8B is a second perspective view of a spring support element.

DETAILED DESCRIPTION

In the drawings, the same components are denoted by the same referencesigns, wherein it is possible for the reference signs to be omitted insome drawings for greater clarity.

FIG. 1A shows a vehicle seat 1 or a vehicle seat substructure 1′,wherein the vehicle seat 1 has a vehicle seat upper part 3 and a vehicleseat lower part 4, which are connected to one another by means of asuspension unit 2 in such a way that the vehicle seat upper part and thevehicle seat lower part can be moved and cushioned relative to oneanother. It can also be seen that the suspension unit 2 is rotatablyconnected about a first axis of rotation 10 to the vehicle seat lowerpart 4.

A locking unit 51 is also preferably provided, comprising a first screwelement 49 and a second screw element 50. The screw elements 49, 50 canconnect the vehicle seat lower part 4 and the suspension unit 2 to oneanother by a rotary movement, so that the suspension unit 2 can nolonger move about the first axis of rotation 10. The screw elements 49,50 can particularly preferably be connected to a support part 40. Thescrew elements 49, 50 are preferably designed as knurled screws. Thescrew elements 49, 50 are more preferably arranged at a distance fromthe first axis of rotation 10, in particular symmetrically with respectto the first axis of rotation 10.

The suspension unit comprises a scissor arrangement 5 having a firstscissor arm 6 and a second scissor arm 7, wherein the suspension unitfurther comprises a spring element support 11 and a first spring element12 and a second spring element 13. As can be seen, the spring elementsupport is rotatably connected about a second axis of rotation to thefirst scissor arm and rotatably connected about a third axis of rotation15 to the second scissor arm 7, wherein the first spring element 12 isconnected to the vehicle seat lower part 4 on the one hand and to thespring element support 11 on the other hand, wherein the first springelement 12 is further arranged at a first angle 16 to a vehicle seatwidth direction B and at a second angle 17 to a vehicle seat heightdirection H.

The more detailed arrangement of the spring elements 12, 13 and the moredetailed configuration of the scissor arrangement 5 are describedfurther in the following drawings.

The first air spring 12 and the second air spring 13 are designed as aresiliently deformable air spring in FIG. 1A, wherein it is alsoconceivable that the first spring element 12 and the second springelement 13 can be designed as a mechanical spring.

It is also conceivable that the first spring element 12 is designed asan air spring and the second spring element 13 is designed as amechanical spring, or vice versa.

Furthermore, the scissor arrangement 5 has a first connecting element 25and a second connecting element 26, wherein the second connectingelement 25 has a first connecting element part 27 and a secondconnecting element part 28, wherein the first connecting element 25 isrotatably connected to the first scissor arm 6 and on the other hand isconnected to a first fixed bearing 29, wherein the first fixed bearing29 is connected to a shaft 20.

Furthermore, the first connecting element part 27 is rotatably connectedto the second scissor arm 7 and rotatably connected to the secondconnecting element part 28, wherein the second connecting element part28 is further rotatably connected to the first scissor arm 7 andconnected to the vehicle seat upper part 3 by means of a fixed bearing30.

FIG. 1B shows the same vehicle seat 1 as shown in FIG. 1A, withadditional damper elements 33 being provided, at least one damperelement 33, preferably at least two damper elements 33 and particularlypreferably four damper elements 33 being provided, which are eacharranged at an angle to the vehicle seat longitudinal direction L, thevehicle seat width direction B and the vehicle seat height direction H.Furthermore, the damper elements 33 are connected to the spring elementsupport 11 on the one hand and to the vehicle seat lower part 4 on theother hand.

In FIGS. 2A, 2B and 2C, the vehicle seat according to FIG. 1A is shownin a front view, wherein in FIG. 2A the vehicle seat 1 is shown in aneutral position N, in FIG. 2B it is shown in a downwardly deflectedposition U, and in FIG. 2C it is shown in an upwardly deflected positionO, wherein “upwardly” and “downwardly” are of course to be understood inthe vehicle seat height direction H in each case.

With regard to FIG. 2A, which shows the vehicle seat 1 in the neutralposition N, it can be seen that the first spring element 12 is arrangedat a first angle 16 and the second spring element 13 at a third angle 18to the vehicle seat width direction B. According to the invention, it isprovided that the first spring element 12 and the second spring element13 are connected to the spring element support 11 on the one hand and tothe vehicle seat lower part 4 on the other hand. In the case of asuspension movement in the vehicle seat height direction H, i.e. in thevertical direction of the vehicle seat 1, it is provided that theposition of the first spring element 12 or the second spring element 13is changed at this point through the connection to the vehicle seatlower part 4, but when moving in the vehicle seat height direction inthe direction H, the spring element support 11 naturally also movesupwards or downwards in the vehicle seat height direction H. This meansthat the connection point between the spring elements 12, 13 to thespring element support 11 also moves upwards or downwards in the vehicleseat height direction H. This means that the first angle 16 and thethird angle 18 are not constant during a suspension movement in thevehicle seat height direction H.

The same also applies to FIGS. 3A and 3B, with the vehicle seat beingshown in the neutral position in FIG. 3A and the vehicle seat beingshown after a rolling movement W in FIG. 3B. In this case, it should benoted that the connection between the spring elements 12, 13 does notmove with the spring element support, but rather the position of thelower connection between the spring elements 12, 13 and the vehicle seatlower part 4 changes. However, the reverse can also occur, depending onthe installation situation and the vibration that occurs.

The change in angles 16, 17, 18, 19 can be seen from a comparison ofFIG. 2A-2C and FIGS. 3A and 3B. An overlay of FIG. 2A-2C is shown inFIG. 4A and an overlay of FIGS. 3A and 3B can be seen in FIG. 4B. Thechange in angle is again shown schematically.

Referring to FIG. 4A, in which, on the one hand, the vehicle seat 1 isshown by the solid lines in a downward position U, and is shown by thedashed lines in an upward position O, wherein the change in theassociated first angle 16 or the third angle 18 can be seen.

FIG. 4B shows the comparison of FIGS. 3A and 3B, a neutral position N ofthe vehicle seat 1 being shown by the solid lines and the rollingposition W of the vehicle seat 1 being shown by the dashed lines.

The vehicle seat 1 according to FIG. 2A can also be seen in FIG. 5,wherein the angles of attack, i.e. the first angle 16 and the thirdangle 18, are different from one another. This means that the firstangle 16 has a different angle from the third angle 18.

In general, the description with regard to the first angle 16 and thethird angle 18 also applies to the second angle 17 and the fourth angle19.

By adjusting the angles 16, 17, 18, 19, the spring stiffnesses in therolling and vertical spring directions are adjusted. Since the positionof the spring element support 11 is arranged so as to not be changed bythe associated axes of rotation, the spring connection points arechanged in the distance from the first axis of rotation 10 with respectto the vehicle seat lower part 4, which causes an angle change of theangles 16, 17, 18, 19.

However, it can also be provided that in a neutral position N of thevehicle seat 1, the first angle 16 corresponds to the third angle 18 andthe second angle 17 corresponds to the fourth angle 19.

The configuration with different angles for the respective springelement 12, 13 makes it possible to adjust the spring stiffness of thespring elements 12, 13.

A first embodiment of the scissor arrangement 5 can be seen in FIG. 6Aand a second embodiment of the scissor arrangement 5 can be seen in FIG.6B.

The embodiment of the scissor arrangement 5 according to FIG. 6A will bedescribed first.

The scissor arrangement 5 comprises a first scissor arm 6, a secondscissor arm 7, a third scissor arm 8 and a fourth scissor arm 9.

The designs of the third scissor arm 8 and the fourth scissor arm 9apply correspondingly to the associated first scissor arm 5 and theassociated second scissor arm 7. This is particularly true since thethird scissor arm 8 runs identically to the first scissor arm 6 and thefourth scissor arm 9 runs identically to the second scissor arm 7.

As can also be seen, the spring element support 11 is provided, which isrotatably connected about a second axis of rotation 14 to the firstscissor arm 6 and rotatably connected about a third axis of rotation 15to the second scissor arm 7.

Furthermore, the first scissor arm 6 is connected to the vehicle seatupper part 3 by means of a first floating bearing 21 and to a shaft 20by means of a second floating bearing 22, and the second scissor arm 7is connected to the vehicle seat upper part 3 by means of a thirdfloating bearing 23 and to the shaft 20 by means of a fourth floatingbearing 24, wherein a first connecting element 25 connects the firstscissor arm 6 to a first fixed bearing 29 which is arranged on the shaft20, and wherein a second connecting element 26 is provided which has afirst connecting element part 27 and a second connecting element part28, wherein the first connecting element part 27 is rotatably connectedto the second scissor arm 7 and the second connecting element part 28,and wherein the second connecting element part 28 is rotatably connectedto the first connecting element part 27, the first scissor arm 6 and thevehicle seat upper part 3. The second connecting element part 28 isrotatably connected in particular to a second fixed bearing 30. Thesecond fixed bearing is arranged on the vehicle seat upper part 3.

The first floating bearing 21 and the second floating bearing 23 areeach designed as running rollers 36, which are rotatably connected tothe respective scissor arm 6, 7, 8, 9 and are mounted in a rollingmanner in a running rail 37, wherein the running rail 37 is arranged onthe vehicle seat upper part 3.

The second floating bearing 22 and the fourth floating bearing 24 aredesigned in such a way that a first displacement element 31 and a seconddisplacement element 32 are provided, wherein the first scissor arm 6 isrotatably connected to the first displacement element and the secondscissor arm 7 is rotatably arranged on the second displacement element32.

The displacement elements 31, 32 can be displaced in such a way thatthey can be displaced with respect to the shaft 20 in the direction ofthe first axis of rotation 10. Further preferably, the displacementelements 31, 32 are mounted rotatably about the first axis of rotation10, in the case of a shaft 20 which has a substantially cylindricaldesign.

The first displacement element 31 and the second displacement element 32are displaced in particular during a vertical movement of the vehicleseat 1.

Because the scissor arms 6, 7, 8, 9 are each connected to the vehicleseat lower part 4 or to the vehicle seat upper part 3 by means of afloating bearing, it is necessary to limit the degrees of freedom withregard to the movement of the scissor arrangement 5. This is done bymeans of the first connecting element 25 and the second connectingelement 26.

Furthermore, the spring element support 11 has an adapter plate 38, bymeans of which the respective spring element 12, 13 (not shown here) canbe connected to the spring element support 11.

The second embodiment, which is shown in FIG. 6B, is identical in termsof its functional principle to the embodiment of FIG. 6A, although theconfiguration differs.

The embodiment of FIG. 6B also includes a first scissor arm 6, a secondscissor arm 7, a third scissor arm 8, and a fourth scissor arm 9,wherein the first scissor arm 6 and the third scissor arm 8 as well asthe second scissor arm 7 and the fourth scissor arm 9 each runidentically. Likewise, the respective scissor arms 6, 7, 8, 9 are guidedin the guide rail 37 of the vehicle seat upper part 3 by means of afloating bearing 21, 23 which is designed as a running roller 36.

This embodiment also has the first connecting element 25 and the secondconnecting element 26 in the same arrangement and function as describedin FIG. 6A.

The arrangement of the floating bearings 22, 24 with respect to thevehicle seat lower part 4 is different here. In particular, a supportpart 40 is shown which is rotatably connected to the vehicle seat lowerpart 4 about the first axis of rotation 10. A shaft 20 is provided atthe front and the rear end of the support part in the vehicle seatlongitudinal direction L, the support part 40 also having running rails37 in which the floating bearings 22, 24 can roll by means of runningrollers 36 with respect to the support part 40.

The first fixed bearing 29, by means of which the first scissor arm 6 isconnected by means of the first connecting element 25, is also arrangedon the support part 40.

A lower adapter plate 39 is also shown schematically in FIG. 6B, bymeans of which the spring element 12, 13 can be connected to the vehicleseat lower part 4. As can be seen, the lower adapter plate 39 has aninclined portion, by means of which the angle of the correspondingspring element 12, 13 and the resulting distance from the first axis ofrotation 10 can be adjusted.

The same also applies to the upper adapter plate 38, which has an anglewith respect to the vehicle seat width direction B, wherein theinclination of the upper adapter plate 38 and of the lower adapter plate39 are parallel to one another. However, an angular offset between theadapter plates 38, 39 can also be provided or permitted.

In FIGS. 7A and 7B, the kinematics of the moving parts of the vehicleseat 1 is shown again schematically.

In FIG. 7A, the vehicle seat is shown in the neutral position N and inFIG. 7B in the downward position U.

The movement of the moving parts, which are denoted by the correspondingreference signs, can be seen by comparing FIGS. 7A and 7B.

Furthermore, FIGS. 8A and 8B show the spring element support 11 in afirst perspective and in a second perspective representation.

The spring element support 11 has a first spring element support holder45 and a second spring element support holder 46, which are connected toone another by means of a connecting part 47. The respective springelement support holder 45, 46 has a first connection point 42 and asecond connection point 43, by means of which the spring element supportcan be connected, in particular rotatably, to the first scissor arm 6and the second scissor arm 7, or to the third scissor arm 8 and thefourth scissor arm 9.

Furthermore, both the first spring element holder 45 and the secondspring element holder 46 have an adapter plate holder 44, by means ofwhich the upper adapter plate 38 can be connected to the spring elementsupport (11).

All features disclosed in the application documents are claimed as beingsubstantial to the invention, provided that they are, individually or incombination, novel over the prior art.

LIST OF REFERENCE SIGNS

1 Vehicle seat

2 Suspension unit

3 Vehicle seat upper part

4 Vehicle seat lower part

5 Scissor arrangement

6 First scissor arm

7 Second scissor arm

8 Third scissor arm

9 Fourth scissor arm

10 First axis of rotation

11 Spring element support

12 First spring element

13 Second spring element

14 Second axis of rotation

15 Third axis of rotation

16 First angle

17 Second angle

18 Third angle

19 Fourth angle

20 Shaft

21 First floating bearing

22 Second floating bearing

23 Third floating bearing

24 Fourth floating bearing

25 First connecting element

26 Second connecting element

27 First connecting element part

28 Second connecting element part

29 First fixed bearing

30 Second fixed bearing

31 First displacement element

32 Second displacement element

33 Damper element

34 First end of the shaft

35 Second end of the shaft

36 Running roller

37 Running rail

38 Adapter plate

39 Lower adapter plate

40 Support part

41 Locking element

42 First connection point

43 Second connection point

44 Adapter plate holder

45 First spring element support holder

46 Second spring element support holder

47 Connecting part

48 Damper element holder

49 First screw element

50 Second screw element

51 Locking unit

N Neutral position

O Upward deflected position

U Downward deflected position

W Rolling position

L Vehicle seat longitudinal direction

B Vehicle seat width direction

H Vehicle seat height direction

What is claimed is:
 1. A vehicle seat comprising a suspension unit forcushioning rolling and vertical suspension movements of the vehicleseat, wherein the vehicle seat has a vehicle seat upper part and avehicle seat lower part, wherein the vehicle seat upper part and thevehicle seat lower part are connected by means of the suspension unit sothat the vehicle seat upper part and the vehicle seat lower part aremovable relative to one another, wherein the suspension unit has ascissor arrangement having a first scissor arm and a second scissor arm,wherein the suspension unit is connected rotatably about a first axis ofrotation to the vehicle seat lower part and comprises a spring elementsupport and a first spring element, the first spring element beingconnected on the one hand to the vehicle seat lower part and on theother hand to the spring element support, and the first spring elementbeing arranged at a first angle to a vehicle seat width direction and ata second angle to a vehicle seat height direction.
 2. The vehicle seataccording to claim 1, wherein the suspension unit comprises a secondspring element, the second spring element being connected on the onehand to the vehicle seat lower part and on the other hand to the springelement support, and the second spring element being arranged at a thirdangle to the vehicle seat width direction and at a fourth angle to thevehicle seat height direction.
 3. The vehicle seat according to claim 1,wherein the first angle and the second angle each have a value from arange ]0; 90°], more preferably from a range of 0 to 90°.
 4. The vehicleseat according to claim 2, wherein the third angle and the fourth angleeach have a value from a range [0; 90°], more preferably from a range of0 to 90°.
 5. The vehicle seat according to claim 1, wherein the firstaxis of rotation is parallel to the vehicle seat longitudinal direction,and wherein the second axis of rotation and the third axis of rotationare arranged extending in the vehicle seat width direction and thesecond and the third axis of rotation are arranged parallel to oneanother.
 6. The vehicle seat according to claim 1, wherein the firstaxis of rotation is defined by a shaft.
 7. The vehicle seat according toclaim 1, wherein the first scissor arm is displaceably connected bymeans of a first floating bearing to the vehicle seat upper part and bymeans of a second floating bearing with respect to the first axis ofrotation, and the second scissor arm is displaceably connected by meansof a third floating bearing to the vehicle seat upper part and by meansof a fourth floating bearing with respect to the first axis of rotation, a first connecting element connecting the first scissor arm to a firstfixed bearing which is arranged rigidly with respect to the first axisof rotation, and a second connecting element being provided which has afirst connecting element part and a second connecting element part,wherein the first connecting element part is rotatably connected to thesecond scissor arm and the second connecting element part, and whereinthe second connecting element part is rotatably connected to the firstconnecting element part, the first scissor arm and the vehicle seatupper part.
 8. The vehicle seat according to claim 1, wherein the firstscissor arm is connected to a support part by means of a fixed bearingand to the vehicle seat upper part by means of a first floating bearing,and the second scissor arm is connected to the vehicle seat upper partby means of a further fixed bearing and to the support part by means ofa fourth floating bearing.
 9. The vehicle seat according to claim 7,wherein the second floating bearing and the fourth floating bearing areeach designed as a displacement element so that the first scissor armand the second scissor arm are in each case displaceable relative to theshaft.
 10. The vehicle seat according to claim 7, wherein when viewed inthe vehicle seat longitudinal direction, the second floating bearing isarranged in front of the third floating bearing and the first floatingbearing is arranged in front of the fourth floating bearing.
 11. Thevehicle seat according to claim 1, wherein the spring element support isrotatably connected about a second axis of rotation to the first scissorarm and rotatably connected about a third axis of rotation to the secondscissor arm.
 12. A vehicle seat having a suspension unit for cushioningrolling and vertical suspension movements of the vehicle, wherein thevehicle seat has a vehicle seat upper part and a vehicle seat lower part, wherein the vehicle seat upper part and the vehicle seat lower partare connected by means of the suspension unit so that the vehicle seatupper part and the vehicle seat lower part are movable relative to oneanother, wherein the suspension unit has a scissor arrangement having afirst scissor arm and a second scissor arm, wherein the suspension unitis connected rotatably about a first axis of rotation to the vehicleseat lower part and comprises a first spring element, the first springelement being connected on the one hand to the vehicle seat lower partand on the other hand to the vehicle seat upper part, and the firstspring element being arranged at a first angle to a vehicle seat widthdirection and at a second angle to a vehicle seat height direction.